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Factor polynomial x^8-x^6-4*x^2-16

An expression to simplify:

The solution

You have entered [src]
 8    6      2     
x  - x  - 4*x  - 16
$$\left(- 4 x^{2} + \left(x^{8} - x^{6}\right)\right) - 16$$
x^8 - x^6 - 4*x^2 - 16
General simplification [src]
       8    6      2
-16 + x  - x  - 4*x 
$$x^{8} - x^{6} - 4 x^{2} - 16$$
-16 + x^8 - x^6 - 4*x^2
Factorization [src]
                        /         ____________\ /         ____________\ /         ____________\ /         ____________\                          
                        |        /       ____ | |        /       ____ | |        /       ____ | |        /       ____ |                          
                        |       /  1   \/ 17  | |       /  1   \/ 17  | |       /  1   \/ 17  | |       /  1   \/ 17  |                          
(x + 1 + I)*(x + 1 - I)*|x +   /   - - ------ |*|x -   /   - - ------ |*|x +   /   - + ------ |*|x -   /   - + ------ |*(x + -1 + I)*(x + -1 - I)
                        \    \/    2     2    / \    \/    2     2    / \    \/    2     2    / \    \/    2     2    /                          
$$\left(x + \left(1 - i\right)\right) \left(x + \left(1 + i\right)\right) \left(x + \sqrt{\frac{1}{2} - \frac{\sqrt{17}}{2}}\right) \left(x - \sqrt{\frac{1}{2} - \frac{\sqrt{17}}{2}}\right) \left(x + \sqrt{\frac{1}{2} + \frac{\sqrt{17}}{2}}\right) \left(x - \sqrt{\frac{1}{2} + \frac{\sqrt{17}}{2}}\right) \left(x + \left(-1 + i\right)\right) \left(x + \left(-1 - i\right)\right)$$
(((((((x + 1 + i)*(x + 1 - i))*(x + sqrt(1/2 - sqrt(17)/2)))*(x - sqrt(1/2 - sqrt(17)/2)))*(x + sqrt(1/2 + sqrt(17)/2)))*(x - sqrt(1/2 + sqrt(17)/2)))*(x - 1 + i))*(x - 1 - i)
Combining rational expressions [src]
       2 /      4 /      2\\
-16 + x *\-4 + x *\-1 + x //
$$x^{2} \left(x^{4} \left(x^{2} - 1\right) - 4\right) - 16$$
-16 + x^2*(-4 + x^4*(-1 + x^2))
Numerical answer [src]
-16.0 + x^8 - x^6 - 4.0*x^2
-16.0 + x^8 - x^6 - 4.0*x^2
Powers [src]
       8    6      2
-16 + x  - x  - 4*x 
$$x^{8} - x^{6} - 4 x^{2} - 16$$
-16 + x^8 - x^6 - 4*x^2
Common denominator [src]
       8    6      2
-16 + x  - x  - 4*x 
$$x^{8} - x^{6} - 4 x^{2} - 16$$
-16 + x^8 - x^6 - 4*x^2
Assemble expression [src]
       8    6      2
-16 + x  - x  - 4*x 
$$x^{8} - x^{6} - 4 x^{2} - 16$$
-16 + x^8 - x^6 - 4*x^2
Combinatorics [src]
/      4    2\ /     2      \ /     2      \
\-4 + x  - x /*\2 + x  - 2*x/*\2 + x  + 2*x/
$$\left(x^{2} - 2 x + 2\right) \left(x^{2} + 2 x + 2\right) \left(x^{4} - x^{2} - 4\right)$$
(-4 + x^4 - x^2)*(2 + x^2 - 2*x)*(2 + x^2 + 2*x)
Trigonometric part [src]
       8    6      2
-16 + x  - x  - 4*x 
$$x^{8} - x^{6} - 4 x^{2} - 16$$
-16 + x^8 - x^6 - 4*x^2
Rational denominator [src]
       8    6      2
-16 + x  - x  - 4*x 
$$x^{8} - x^{6} - 4 x^{2} - 16$$
-16 + x^8 - x^6 - 4*x^2